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- Timeline of invention (28171 bytes)
3: ...ntion into a practical form. Where there is ambiguity, the date of the first practical, fielded versio...
5: ===[[Paleolithic|Paleolithic Era]]===
36: * 3500 BC: [[Cuneiform script|Writing]] in [[Sumer]]
62: ...century BC|400s BC]]: [[Catapult]] in [[Syracuse, Italy|Syracuse]]
99: ...eglasses]] in [[Italy in the Middle Ages|Northern Italy]] - List of inventors (14020 bytes)
15: *[[Joseph Aspdin]], British inventor of cement in 1824
22: ... - (1938-) U.S. solar inventor and developer; architectural designer.
24: ...rdeen]], (1908-1991) — co-inventor of the [[transistor]]
28: ...Emile Berliner]], (1851-1929) [[Germany]] and [[United States|USA]] — [[gramophone]]
31: *[[Bi Sheng]] — primitive movable [[printing]] types - Computer (32773 bytes)
3: ...in this way is given appropriate input data, then it can automatically solve the problem or predict th...
10: ...s possible onto the physical phenomena being exploited. For example, electron flows might be used to ...
14: ...al ones). This basic idea, which made modern ''digital'' computers possible, was formally identified a...
18: ...through output devices like light bulbs, LEDs, monitors, and printers.
20: ...rbitrary patterns of light by the output device. It is the human brain which recognizes that those pa... - Electricity (13894 bytes)
1: ...ite-charged objects attract one another. The magnitude of the force of attraction or repulsion is giv...
3: ...ge. For example, "''Q'' = 0.5 C" means "the quantity of electric charge is 0.5 coulomb."
6: ... to jump. This is the origin of the word "electricity", from the [[Greek language|Greek]] ''ēlekt...
8: ...l digs have been alleged to be [[battery (electricity)|electrical batteries]].
10: ...ed in [[1747]] that a discharge of static electricity was equivalent to an [[electric current]]. - Gallium (9500 bytes)
1: <!-- Here is a table of data; skip past it to edit the text. -->
26: | [[Density]], [[Mohs hardness scale|Hardness]]
30: | align="center" | silvery white
49: ...i>]</nowiki>3[[d-orbital|d]]<sup>10</sup> 4[[s-orbital|s]]<sup>2</sup> 4p<sup>1</sup>
66: | 302.9146 [[Kelvin|K]] (85.5766 ?[[Fahrenheit|F]]) - Germanium (8776 bytes)
1: <!-- Here is a table of data; skip past it to edit the text. -->
26: | [[Density]], [[Mohs hardness scale|Hardness]]
30: | align="center" | greyish white<br>[[Image:Ge,32.jpg|125px|]]
35: | 72.64 [[Atomic mass unit|amu]]
64: | 1211.4 [[Kelvin|K]] (1720.9 ?[[Fahrenheit|F]]) - Molybdenum (10247 bytes)
1: <!-- Here is a table of data; skip past it to edit the text. -->
20: | [[transition metal]]
25: | [[Density]], [[Mohs hardness scale|Hardness]]
34: | 95.94 [[Atomic mass unit|amu]]
46: ...ypton|Kr]]<nowiki>]</nowiki>4d<sup>5</sup>5[[s-orbital|s]]<sup>1</sup> - Nitrogen (10073 bytes)
1: {{Elementbox_header | number=7 | symbol=N | name=nitrogen | left=[[carbon]] | right=[[oxygen]] | above...
14: {{Elementbox_heatcapacity_jpmolkat25 | (N<sub>2</sub>)<br />29.124 }}
30: {{Elementbox_isotopes_begin | isotopesof=nitrogen | color1=#a0ffa0 | color2=green }}
31: {{Elementbox_isotopes_stable | mn=14 | sym=[[nitrogen-14|N]] | na=99.634% | n=7 }}
32: {{Elementbox_isotopes_stable | mn=15 | sym=[[nitrogen-15|N]] | na=0.366% | n=8 }} - Silicon (13233 bytes)
10: {{Elementbox_density_gpcm3nrt | 2.33 }}
11: {{Elementbox_densityliq_gpcm3mp | 2.57 }}
16: {{Elementbox_heatcapacity_jpmolkat25 | 19.789 }}
44: ...ith [[reverse leakage current]] flow, and because its [[passivation|native oxide]] forms better semico...
47: ...nce the number of free charge carriers increases with temperature. - Computer display (4276 bytes)
1: ...to be ambiguous alongside the other senses of "monitor" meaning "machine-level debugger" or "thread sy...
4: As with [[television]], several different [[hardware]] t...
11: ...0) up to 2048 by 1536 pixels (2048ױ536) with 32-bit colour and a variety of [[refresh rate]]s.
13: ...ts [[dot pitch]]. In general, the lower the dot pitch, (e.g. .24), the sharper the picture will be.
15: ...abel "glass [[teletype]]s", because of the similarity to their electromechanical predecessors. - Inorganic chemistry (2930 bytes)
1: ...stry''' is the branch of [[chemistry]] concerned with the properties and reactions of [[inorganic comp...
4: ...l reactions: [[combination reaction]]s, [[decomposition reaction]]s, [[single displacement reaction]]s...
13: ...ude [[Semiconductor|silicon chips]], [[transistor|transistors]], [[Liquid crystal display|LCD]] screens, [[fib...
15: ...] and [[materials chemistry]]. It often overlaps with [[geochemistry]], [[analytical chemistry]], [[en...
17: ...hrough the carbon. [[Vitamin B12]], whose active site is similar to that of [[hemoglobin|haemoglobin]]... - Tim Berners-Lee (7363 bytes)
2: ...the [[World Wide Web Consortium]], which oversees its continued development.
6: ...and was subsequently banned from using the university computer.
8: ...mmer, and in [[1978]] he worked at [[D.G. Nash Limited]] where he worked on typesetting software and a...
12: ...ring and updating information among researchers. With help from [[Robert Cailliau]] he built a prototy...
16: ==The first website== - Physics (25628 bytes)
4: ...ology]], [[chemistry]], [[geology]], etc.) deals with particular types of material systems that obey t...
6: ...stract patterns that need not have any bearing on it. However, the distinction is not always clear-cut...
12: ..., most individual physicists have specialized in either [[theoretical physics]] or [[experimental phys...
15: ...n go in the wrong direction; this is one of the criticisms that have been levelled against [[M-theory]...
19: ...asically correct, within a certain domain of validity. For instance, the theory of [[classical mechani...
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